Apparatus or gear for transmitting motion at variable speed.



Patented Nov. I9,.I90I. A. WACH &. A. KRIGEH.

APPARATUS 0R GEAR FOR TRANSMITTING MOTION AT VARIABLE SPEED.

(Application led Sept. 1 0, 1900.)

5 Sheets-Sheet I.

(No Model.)

Patentd Nov. 19, lem.

A. wAcH a A. KmGE-R. APPARATUS 0R GEAR F08 TRANSMITTING MOTION ATVARIABLE SPEED.

(Application med sept.A 1o, 1900.)

5 sheets-'sheet 2.

(No Model.)

IIIH

Tn: Norms PETzRs co., n imauwo.. wAsmNcToN, D. x:4

Patented Nov. I9, |90I. A. WACH &. A. KHIGER. l APPARATUS 0R GEAR FORTBANSMITTING MOTION AT VARIABLE SPEED.

(Application filed Sept. 10, 1900.)

5 Sheets-Sheet 3.

(No Model.)

m: Humps FEVER: co, PHmLn'Ho.. wAsumGTon, o. c

No. 687,090. Patented Nov. I9, |901.

A. WACH & A. KRIGER.

APPARATus 0R GEAR PoR TRANsmTTlNa MoTloN AT VARIABLE SPEED.

(Application led Sept. 10, [900.)

(No Model.) 5 Sheets-Sheet 4.

,Patented Nov. I9, |90I.

4 A. wAcH & A. KRIGER. APPARATUS 0R GEAR FOR TRANSMITTING MUTION ATVARIABLE SPEED.

(Application led Sept. 10, 1900.)

5 Sheets-Sheet 5.

Tn: Nonms ruins co. PHOTO-nwo., wAsnmsTon. D. c

NrTED STATES PATENT OFFICE.

ARMAND wAcHE AND ALPHONSE KRIEGER, oF PARIs, FRANCE.

APPARATUS OR GEAR FOR TRANSMITTING MOTIUN AT VARIABLE SPEED.

SPECIFICATION forming part of Letters Patent No. 687,090, dated November19, 1901.

Application filed September 10, 1900. Serial No. 29,638. (No model.)

To @ZZ whom it may concern.-

Be it known that we, ARMAND WACH, residing at 83 Boulevard Voltaire, andAL- PHONSE KRIGER, residing at 195 Boulevard Voltaire, Paris, in theRepublic otl France, engineers, citizens of the Republic of France, haveinvented certain new and useful Improvements in Apparatus or Gear forTransmitting Motion at Variable Speed, of which the following is aspecification.

Our invention relates to an apparatus or gearing for transmittingmotion, and comprises pulleys whereby the rate of transmission between adriving and a receiving shaft can be varied at will and graduallywithout ever modifying the tension of the transmitting-belt. The said,'pulleys are formed by an extensible limb or rim, the members of whichare pivoted together in parallelograms and fixed from distance todistance to supports movablein aradial direction and which can bedisplaced at will by means of two series of inclined guides, the saidseries being capable of being brought nearer together or placed fartherapart from each other.

The accompanying drawings show .by way of example several forms by whichthe object of our invention can be attained.

Figure l shows transmitting-gearing comprising two pulleys connectedtogether by a transversal shaft having pinions. Fig. 2 is a sectionalview of similar gearing in which the pulleys are connected together bymeans of a lever. Fig. 3 shows the details of a pulley as seen in frontview, different parts being removed. Fig. 4 is a side view of thepulley. Fig. 5 shows a modified form of the transmitting-gearing. Fig. 6is a cross-sectional View of a pulley in the position in which itsdiameter is the greatest, the dotted lines showing the position of theparts when the diameter is smallest. Fig. 7 is a partelevationcorresponding to Fig. 6. cross-sectional view of a modified form ofextensible pulley, and Fig. 9 is a face view of a portion of saidpulley. y

The apparatus or transmitting-gear shown in Figs. l to 4, inclusive,comprises two extensible pulleys A B, Figs. 1 and 2, xed, respectively,on the two parallel shafts aand b and connected together by atransmittingbelt. (Not shown in the drawings.) The said Fig. 8 isaapparatus also comprises a controlling de vice, such as a shaft c, Fig.1, which may be revolved by means of a lever, sprocketwheel, orfly-wheel d, by a lever e, Fig. 2,

oscillating around a spindle f, located between the shafts ot b aindoperated by ascrew g or by any other suitable device for movingsimultaneously and in opposite directions two sleeves h t', slidable onthe shafts a and b.

Each ofthe pulleys A B comprises, as shown A in Figs. 3 and 4, anextensible limb or rim formed by small bars j, pivoted together inlazy-tongs fashion by means of rivets lo. The said rim is supported bysupports m, parallel to the shaft a and which are guided at one end byradial slots n in a fixed member in the form of a plate o, keyed to theshaft a. The said supports are `connected to the rim by rivets or pivotsk, located in the middle of the small bars j. two internal ears lo,through which passes a pin q. The latter is also engaged in thecurvilinear slot or race r in an arm s, pivoted to the hub of the plateo in the same plane as the axis of the shaft and forming a movablemember adapted to be moved toward and from the fixed member.

To obtain the radial displacement of the supports m and the variationsof the diameter of the rim which follow such displacement, all that needbe done is to cause several arms s to move on their pivots, which can bedone by means of a toothed segment i, provided on the said arms andgearing with a fluted part h' of the sleeve h, which constitutes acylindrical rack free to slide on the shaft a.

When the sliding movement of the sleeve h is obtained by means of ashaft c, as shown in Fig. l, we may arrange on the said shaft a pinionu, meshing with a rack fv, connected by a collar to the sleeve h. Thesaid rack 'v may be guided by a block y, loosely mounted'on the shaft a.between two parts z, and thus serving also as a support for the shaft c.By placing a pinion u above the shaft a and another similar pinion underthe shaft bwe are able to move simultaneously and in opposite directionsthe sleeves h and z', so that one of the pulleys A or B increases indiameter IOO when the other decreases in diameter, and

vice versa. f

in case a lever e, Fig. 2, 1s used to move the sleeves 7L and tthelatter can be connected to the ends of the lever by means of a ringw, provided with trunnions l, as shown, or by means ot' a fork engagedin a groove or other known device.

In Fig. 5 the transmittinggear comprises two extensible pulleys A and B,lixed, re spectively, on the driving-shaft ct and the receiving-shaft b.A belt (not shown) passes over the said pulleys, and levers e allowr ofmoving simultaneously and in opposite directions the devices modifyingthe diameter of the pulleys. The said levers e oscillate around a fixedspindle f, located at the middle of the levers, and they are controlledor operated by means of a rod g, having right and left handscrew-threads passing through nuts formed in each of the same. Accordingto the direction of the rotation imparted to the 2o screw-threaded rodg-by means, for example, of a chain passing over the sprocketwheel Z-thelevers e e close and open as scissors do.

In Figs. 6 and 7 is shown the form of pulley shown in Fig. 5. Thispulley comprisesa jointed rim formed of thin metal barsj, thelatterbeing connected one to another by pivots 7c, which leave them freeto move in the same manner as lazy-tongs. The said rim is sup ported bytwo series of guides'n and Q in the form of inclined rods secured to thecollars o and h2, respectively. The collars o and h2 are slidablymounted on the shaft d, but unable to turn on the same. Each of the said"u-ods is passed through an opening or eyelet formed in the end ofthesupports m, connected to the rim by the rivets or pivots lo, so thatwhen the collar 722 is moved away from the collar o the supports m areforced to slide 4o along the rods and come nearer to the shaft,

thus reducing the diameter of the pulley. The diameter of the latter isincreased, on the contrary, when the collar h2 is moved toward thecollar o.

It will be easily understood that in all the positions given to thelevers e the variations ofthe diameter are 4always proportional to thevariations given to the distance which separates the collars o/ and h2.Each of the 5o said collars is connected by a cup 4, screwed onto itshub, to a ring 5, loosely mounted on the shaft and provided with twotrunnions, on which turn the bifurcated end of one of the levers e.

An annular series of balls 6 can be interposed between the cup t and thefaces of the ring 5 and hub in order to reduce wear and posite side byinclined rods Q2, fixed on the collar h2, which is slidable on the shafta and forming, with said rods, a fixed member. The rim is connected tothe supports m by a certain number of rivets or pivots 7c engaging inslideways 7, made in the said supports. The variations of the diameterof the pulley thus constructed are obtained by moving the collar h2 onthe shaft by means of a contracting lever e of the same character as thelever e shown in Fig. 2. As in the previous arrangements the variationsof diameter are proportional to the displacements of the collar h2, sothat in two pulleys connected together and having their4 collars h2connect,

ed by a lever e oscillating at its middle the said variations ofdiameter are always equal at all times for both pulleys, and they do notmodify the tension of the belt.

Ve reserve to ourselves the right of modif yin g the construction andarrangement hereinbefore described and to replace the same by anyequivalent arrangement based on the principles specified.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

l. An expanding pulley having two members at least one of which ismovable relatively toward and from the other, supports having radialsliding movement on said members, an expanding rim carried by thesupports and comprising bars pivoted together in lazy-ton gs fashion,and means whereby the members are made to approach or recede from eachother.

2. An expanding pulley havingafixed mem ber, a movable member, means formoving the movable member toward and from the fixed member, supportshaving radial guided movement on said members as they approach andrecede from each other, and anexpanding rim carried bythe supports andoperated thereby.

3. An expanding pulley havinga fixed mem ber, movable arms, supportshaving sliding movement on said member and arms, an ex panding rimconnected with the supports, and 'means for operating the movable armsto cause them to move toward and from the fixed member.

4. An expanding pulley having an expand ing rim provided with supports,a pulley`plate or frame provided with outwa1dlyranging guides engaged bysaid supports, a series of toothed spreading arms pivoted to said frameand having a sliding connection with the rim supports, and a rackengaging said toothed arms and movable lengthwise of the pulleys axis.

5. An expanding pulley having an expanding rim provided with supports, apulley plate or frame provided with outwardly-ranging guides engaged bysaid supports, a series of toothed spreading arms pivoted to said frame'and havin ga sliding connection with the rim- IOO IIO

supports, and a grooved sleeve forming a rack in engagement with saidtoothed arms, and movable lengthwise of the pulleys axis.

6. An expanding pulley having an expand- 5 ing rim provided withsupports, a fixed plate provided with radial slots, in which work oneend of the supports, a series of toothed arms pivoted to the hub of thesaid plate and provided with curved slots in which work pins 1o carriedby the rim-supports, and a sliding sleeve provided with a luted portionengaging the toothed armsh 7. A speed-changing mechanism, comprising twopulleys each having an expanding rim provided with supports, a pulleyplate or frame provided with outwardly ranging guides engaged by saidrim-supports, a series of toothed spreading arms pivoted to said frameand having a sliding connection with zo the rim-supports, a groovedsleeve forming a rack in engagement with said toothed arms, and aconnection between the sleeves of the two pulleys to expand one whilethe other is being contracted.

8. A speed-changing mechanism, comprising two pulleys each having anexpanding rim provided with supports, a pulley plate or frame providedwith outwardly ranging guides engaged bysaid rim-supports, a series 3oof toothed spreading arms pivoted to said frame and having a slidingconnection with the rim-supports, a rack in engagement with said toothedarms, and a connection between the racks of the two pulleys, to expandone while the other is being contracted. 3 5

9. A speed-changing mechanism, comprising two pulleys each having anexpanding rim provided with supports, a pulley plate or frame providedwith outwardly-ranging guides engaged by said supports, a set of 4oguides, movable lengthwise of the pulleys axis and each disposed in thesame longitudinal plane with one of the irst-namedguides, the second setof guides being likewise engaged by the rim-supports, a sleeve movablelengthwise of the pulleys axis and operatively connected with the secondset of guides, a rack secured to each sleeve, said racks being arrangedon opposite sides of the sleeves in the two pulleys, and a shaftarranged ad- 5o jacent to said sleeves on opposite sides thereof andhaving pinions in engagement with said racks.

In testimony that we claim the foregoing as our invention we have signedour names in presence of two subscribing witnesses.

ARMAND wAoH. ALPHONSE KRIGER.

Witnesses 2 CAMILLE BLETRY, EUGENE WATTIER.

